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-rwxr-xr-xsrc/keytrans/pem2openpgp519
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diff --git a/src/keytrans/pem2openpgp b/src/keytrans/pem2openpgp
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-#!/usr/bin/perl -w -T
-
-# pem2openpgp: take a PEM-encoded RSA private-key on standard input, a
-# User ID as the first argument, and generate an OpenPGP secret key
-# and certificate from it.
-
-# WARNING: the secret key material *will* appear on stdout (albeit in
-# OpenPGP form) -- if you redirect stdout to a file, make sure the
-# permissions on that file are appropriately locked down!
-
-# Usage:
-
-# pem2openpgp 'ssh://'$(hostname -f) < /etc/ssh/ssh_host_rsa_key | gpg --import
-
-# Authors:
-# Jameson Rollins <jrollins@finestructure.net>
-# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
-
-# Started on: 2009-01-07 02:01:19-0500
-
-# License: GPL v3 or later (we may need to adjust this given that this
-# connects to OpenSSL via perl)
-
-use strict;
-use warnings;
-use Crypt::OpenSSL::RSA;
-use Crypt::OpenSSL::Bignum;
-use Crypt::OpenSSL::Bignum::CTX;
-use Digest::SHA1;
-use MIME::Base64;
-
-## make sure all length() and substr() calls use bytes only:
-use bytes;
-
-my $uid = shift;
-
-# FIXME: fail if there is no given user ID; or should we default to
-# hostname_long() from Sys::Hostname::Long ?
-
-
-my $old_format_packet_lengths = { one => 0,
- two => 1,
- four => 2,
- indeterminate => 3,
-};
-
-# see RFC 4880 section 9.1 (ignoring deprecated algorithms for now)
-my $asym_algos = { rsa => 1,
- elgamal => 16,
- dsa => 17,
- };
-
-# see RFC 4880 section 9.2
-my $ciphers = { plaintext => 0,
- idea => 1,
- tripledes => 2,
- cast5 => 3,
- blowfish => 4,
- aes128 => 7,
- aes192 => 8,
- aes256 => 9,
- twofish => 10,
- };
-
-# see RFC 4880 section 9.3
-my $zips = { uncompressed => 0,
- zip => 1,
- zlib => 2,
- bzip2 => 3,
- };
-
-# see RFC 4880 section 9.4
-my $digests = { md5 => 1,
- sha1 => 2,
- ripemd160 => 3,
- sha256 => 8,
- sha384 => 9,
- sha512 => 10,
- sha224 => 11,
- };
-
-# see RFC 4880 section 5.2.3.21
-my $usage_flags = { certify => 0x01,
- sign => 0x02,
- encrypt_comms => 0x04,
- encrypt_storage => 0x08,
- encrypt => 0x0c, ## both comms and storage
- split => 0x10, # the private key is split via secret sharing
- authenticate => 0x20,
- shared => 0x80, # more than one person holds the entire private key
- };
-
-# see RFC 4880 section 4.3
-my $packet_types = { pubkey_enc_session => 1,
- sig => 2,
- symkey_enc_session => 3,
- onepass_sig => 4,
- seckey => 5,
- pubkey => 6,
- sec_subkey => 7,
- compressed_data => 8,
- symenc_data => 9,
- marker => 10,
- literal => 11,
- trust => 12,
- uid => 13,
- pub_subkey => 14,
- uat => 17,
- symenc_w_integrity => 18,
- mdc => 19,
- };
-
-# see RFC 4880 section 5.2.1
-my $sig_types = { binary_doc => 0x00,
- text_doc => 0x01,
- standalone => 0x02,
- generic_certification => 0x10,
- persona_certification => 0x11,
- casual_certification => 0x12,
- positive_certification => 0x13,
- subkey_binding => 0x18,
- primary_key_binding => 0x19,
- key_signature => 0x1f,
- key_revocation => 0x20,
- subkey_revocation => 0x28,
- certification_revocation => 0x30,
- timestamp => 0x40,
- thirdparty => 0x50,
- };
-
-
-# see RFC 4880 section 5.2.3.1
-my $subpacket_types = { sig_creation_time => 2,
- sig_expiration_time => 3,
- exportable => 4,
- trust_sig => 5,
- regex => 6,
- revocable => 7,
- key_expiration_time => 9,
- preferred_cipher => 11,
- revocation_key => 12,
- issuer => 16,
- notation => 20,
- preferred_digest => 21,
- preferred_compression => 22,
- keyserver_prefs => 23,
- preferred_keyserver => 24,
- primary_uid => 25,
- policy_uri => 26,
- usage_flags => 27,
- signers_uid => 28,
- revocation_reason => 29,
- features => 30,
- signature_target => 31,
- embedded_signature => 32,
- };
-
-# bitstring (see RFC 4880 section 5.2.3.24)
-my $features = { mdc => 0x01
- };
-
-# bitstring (see RFC 4880 5.2.3.17)
-my $keyserver_prefs = { nomodify => 0x80
- };
-
-###### end lookup tables ######
-
-# FIXME: if we want to be able to interpret openpgp data as well as
-# produce it, we need to produce key/value-swapped lookup tables as well.
-
-
-########### Math/Utility Functions ##############
-
-
-# see the bottom of page 43 of RFC 4880
-sub simple_checksum {
- my $bytes = shift;
-
- return unpack("%32W*",$bytes) % 65536;
-}
-
-# calculate the multiplicative inverse of a mod b this is euclid's
-# extended algorithm. For more information see:
-# http://en.wikipedia.org/wiki/Extended_Euclidean_algorithm the
-# arguments here should be Crypt::OpenSSL::Bignum objects. $a should
-# be the larger of the two values, and the two values should be
-# coprime.
-
-sub modular_multi_inverse {
- my $a = shift;
- my $b = shift;
-
-
- my $origdivisor = $b->copy();
-
- my $ctx = Crypt::OpenSSL::Bignum::CTX->new();
- my $x = Crypt::OpenSSL::Bignum->zero();
- my $y = Crypt::OpenSSL::Bignum->one();
- my $lastx = Crypt::OpenSSL::Bignum->one();
- my $lasty = Crypt::OpenSSL::Bignum->zero();
-
- my $finalquotient;
- my $finalremainder;
-
- while (! $b->is_zero()) {
- my ($quotient, $remainder) = $a->div($b, $ctx);
-
- $a = $b;
- $b = $remainder;
-
- my $temp = $x;
- $x = $lastx->sub($quotient->mul($x, $ctx));
- $lastx = $temp;
-
- $temp = $y;
- $y = $lasty->sub($quotient->mul($y, $ctx));
- $lasty = $temp;
- }
-
- if (!$a->is_one()) {
- die "did this math wrong.\n";
- }
-
- # let's make sure that we return a positive value because RFC 4880,
- # section 3.2 only allows unsigned values:
-
- ($finalquotient, $finalremainder) = $lastx->add($origdivisor)->div($origdivisor, $ctx);
-
- return $finalremainder;
-}
-
-
-############ OpenPGP formatting functions ############
-
-# make an old-style packet out of the given packet type and body.
-# old-style (see RFC 4880 section 4.2)
-sub make_packet {
- my $type = shift;
- my $body = shift;
- my $options = shift;
-
- my $len = length($body);
- my $pseudolen = $len;
-
- # if the caller wants to use at least N octets of packet length,
- # pretend that we're using that many.
- if (defined $options && defined $options->{'packet_length'}) {
- $pseudolen = 2**($options->{'packet_length'} * 8) - 1;
- }
- if ($pseudolen < $len) {
- $pseudolen = $len;
- }
-
- my $lenbytes;
- my $lencode;
-
- if ($pseudolen < 2**8) {
- $lenbytes = $old_format_packet_lengths->{one};
- $lencode = 'C';
- } elsif ($pseudolen < 2**16) {
- $lenbytes = $old_format_packet_lengths->{two};
- $lencode = 'n';
- } elsif ($pseudolen < 2**31) {
- ## not testing against full 32 bits because i don't want to deal
- ## with potential overflow.
- $lenbytes = $old_format_packet_lengths->{four};
- $lencode = 'N';
- } else {
- ## what the hell do we do here?
- $lenbytes = $old_format_packet_lengths->{indeterminate};
- $lencode = '';
- }
-
- return pack('C'.$lencode, 0x80 + ($type * 4) + $lenbytes, $len).
- $body;
-}
-
-
-# takes a Crypt::OpenSSL::Bignum, returns it formatted as OpenPGP MPI
-# (RFC 4880 section 3.2)
-sub mpi_pack {
- my $num = shift;
-
- my $val = $num->to_bin();
- my $mpilen = length($val)*8;
-
-# this is a kludgy way to get the number of significant bits in the
-# first byte:
- my $bitsinfirstbyte = length(sprintf("%b", ord($val)));
-
- $mpilen -= (8 - $bitsinfirstbyte);
-
- return pack('n', $mpilen).$val;
-}
-
-# FIXME: genericize these to accept either RSA or DSA keys:
-sub make_rsa_pub_key_body {
- my $key = shift;
- my $timestamp = shift;
-
- my ($n, $e) = $key->get_key_parameters();
-
- return
- pack('CN', 4, $timestamp).
- pack('C', $asym_algos->{rsa}).
- mpi_pack($n).
- mpi_pack($e);
-}
-
-sub make_rsa_sec_key_body {
- my $key = shift;
- my $timestamp = shift;
-
- # we're not using $a and $b, but we need them to get to $c.
- my ($n, $e, $d, $p, $q) = $key->get_key_parameters();
-
- my $c3 = modular_multi_inverse($p, $q);
-
- my $secret_material = mpi_pack($d).
- mpi_pack($p).
- mpi_pack($q).
- mpi_pack($c3);
-
- # according to Crypt::OpenSSL::RSA, the closest value we can get out
- # of get_key_parameters is 1/q mod p; but according to sec 5.5.3 of
- # RFC 4880, we're actually looking for u, the multiplicative inverse
- # of p, mod q. This is why we're calculating the value directly
- # with modular_multi_inverse.
-
- return
- pack('CN', 4, $timestamp).
- pack('C', $asym_algos->{rsa}).
- mpi_pack($n).
- mpi_pack($e).
- pack('C', 0). # seckey material is not encrypted -- see RFC 4880 sec 5.5.3
- $secret_material.
- pack('n', simple_checksum($secret_material));
-}
-
-# expects an RSA key (public or private) and a timestamp
-sub fingerprint {
- my $key = shift;
- my $timestamp = shift;
-
- my $rsabody = make_rsa_pub_key_body($key, $timestamp);
-
- return Digest::SHA1::sha1(pack('Cn', 0x99, length($rsabody)).$rsabody);
-}
-
-
-my $rsa;
-if (defined $ENV{PEM2OPENPGP_NEWKEY}) {
- $rsa = Crypt::OpenSSL::RSA->generate_key($ENV{PEM2OPENPGP_NEWKEY});
-} else {
- # we're just not dealing with newline business right now. slurp in
- # the whole file.
- undef $/;
- $rsa = Crypt::OpenSSL::RSA->new_private_key(<STDIN>);
-}
-
-$rsa->use_sha1_hash();
-
-# see page 22 of RFC 4880 for why i think this is the right padding
-# choice to use:
-$rsa->use_pkcs1_padding();
-
-if (! $rsa->check_key()) {
- die "key does not check";
-}
-
-my $version = pack('C', 4);
-# strong assertion of identity:
-my $sigtype = pack('C', $sig_types->{positive_certification});
-# RSA
-my $pubkey_algo = pack('C', $asym_algos->{rsa});
-# SHA1
-my $hash_algo = pack('C', $digests->{sha1});
-
-# FIXME: i'm worried about generating a bazillion new OpenPGP
-# certificates from the same key, which could easily happen if you run
-# this script more than once against the same key (because the
-# timestamps will differ). How can we prevent this?
-
-# this environment variable (if set) overrides the current time, to
-# be able to create a standard key? If we read the key from a file
-# instead of stdin, should we use the creation time on the file?
-my $timestamp = 0;
-if (defined $ENV{PEM2OPENPGP_TIMESTAMP}) {
- $timestamp = ($ENV{PEM2OPENPGP_TIMESTAMP} + 0);
-} else {
- $timestamp = time();
-}
-
-my $creation_time_packet = pack('CCN', 5, $subpacket_types->{sig_creation_time}, $timestamp);
-
-
-my $flags = 0;
-if (! defined $ENV{PEM2OPENPGP_USAGE_FLAGS}) {
- $flags = $usage_flags->{certify};
-} else {
- my @ff = split(",", $ENV{PEM2OPENPGP_USAGE_FLAGS});
- foreach my $f (@ff) {
- if (! defined $usage_flags->{$f}) {
- die "No such flag $f";
- }
- $flags |= $usage_flags->{$f};
- }
-}
-
-my $usage_packet = pack('CCC', 2, $subpacket_types->{usage_flags}, $flags);
-
-
-# how should we determine how far off to set the expiration date?
-# default is no expiration. Specify the timestamp in seconds from the
-# key creation.
-my $expiration_packet = '';
-if (defined $ENV{PEM2OPENPGP_EXPIRATION}) {
- my $expires_in = $ENV{PEM2OPENPGP_EXPIRATION} + 0;
- $expiration_packet = pack('CCN', 5, $subpacket_types->{key_expiration_time}, $expires_in);
-}
-
-
-# prefer AES-256, AES-192, AES-128, CAST5, 3DES:
-my $pref_sym_algos = pack('CCCCCCC', 6, $subpacket_types->{preferred_cipher},
- $ciphers->{aes256},
- $ciphers->{aes192},
- $ciphers->{aes128},
- $ciphers->{cast5},
- $ciphers->{tripledes}
- );
-
-# prefer SHA-1, SHA-256, RIPE-MD/160
-my $pref_hash_algos = pack('CCCCC', 4, $subpacket_types->{preferred_digest},
- $digests->{sha1},
- $digests->{sha256},
- $digests->{ripemd160}
- );
-
-# prefer ZLIB, BZip2, ZIP
-my $pref_zip_algos = pack('CCCCC', 4, $subpacket_types->{preferred_compression},
- $zips->{zlib},
- $zips->{bzip2},
- $zips->{zip}
- );
-
-# we support the MDC feature:
-my $feature_subpacket = pack('CCC', 2, $subpacket_types->{features},
- $features->{mdc});
-
-# keyserver preference: only owner modify (???):
-my $keyserver_pref = pack('CCC', 2, $subpacket_types->{keyserver_prefs},
- $keyserver_prefs->{nomodify});
-
-my $subpackets_to_be_hashed =
- $creation_time_packet.
- $usage_packet.
- $expiration_packet.
- $pref_sym_algos.
- $pref_hash_algos.
- $pref_zip_algos.
- $feature_subpacket.
- $keyserver_pref;
-
-my $subpacket_octets = pack('n', length($subpackets_to_be_hashed));
-
-my $sig_data_to_be_hashed =
- $version.
- $sigtype.
- $pubkey_algo.
- $hash_algo.
- $subpacket_octets.
- $subpackets_to_be_hashed;
-
-my $pubkey = make_rsa_pub_key_body($rsa, $timestamp);
-my $seckey = make_rsa_sec_key_body($rsa, $timestamp);
-
-# this is for signing. it needs to be an old-style header with a
-# 2-packet octet count.
-
-my $key_data = make_packet($packet_types->{pubkey}, $pubkey, {'packet_length'=>2});
-
-# take the last 8 bytes of the fingerprint as the keyid:
-my $keyid = substr(fingerprint($rsa, $timestamp), 20 - 8, 8);
-
-# the v4 signature trailer is:
-
-# version number, literal 0xff, and then a 4-byte count of the
-# signature data itself.
-my $trailer = pack('CCN', 4, 0xff, length($sig_data_to_be_hashed));
-
-my $uid_data =
- pack('CN', 0xb4, length($uid)).
- $uid;
-
-my $datatosign =
- $key_data.
- $uid_data.
- $sig_data_to_be_hashed.
- $trailer;
-
-my $data_hash = Digest::SHA1::sha1_hex($datatosign);
-
-my $issuer_packet = pack('CCa8', 9, $subpacket_types->{issuer}, $keyid);
-
-my $sig = Crypt::OpenSSL::Bignum->new_from_bin($rsa->sign($datatosign));
-
-my $sig_body =
- $sig_data_to_be_hashed.
- pack('n', length($issuer_packet)).
- $issuer_packet.
- pack('n', hex(substr($data_hash, 0, 4))).
- mpi_pack($sig);
-
-print
- make_packet($packet_types->{seckey}, $seckey).
- make_packet($packet_types->{uid}, $uid).
- make_packet($packet_types->{sig}, $sig_body);
-
-
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